题目内容

甲、乙、丙三个班同时进行考试,其中甲、乙、丙三个班的人数分别占总人数的40%,30%和30%,不通过考试的比率分别为10%、15% 和18%,现从考生中随机抽取一个学生,则他不通过考试的概率为,若某学生不通过考试,则它是来自甲班的概率.(若结果不为整数,请用小数表示,且小数点后保留3位有效数字)

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